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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4e6c22ecfc52be6794fea85edb14a31ac87430fdfd3094bb1c1159211ad2a50' 
  AND token = 'orGJtWiZc62Z8mcMYg3BU6zgkZg6A4/EourWTJjX/iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}