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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be561d0ff73a8c0e5a5591517772e287051d179f0a514f8252375f90c47040ae' 
  AND token = 'UsAR4KI+MnFEaAOclSq9/q1tgYluffk8FENAilpSZ8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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