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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be1c4d72e8d42b4fec0291218c20e033a7b426bb1384d357dd863f4c0bca479a' 
  AND token = 'P4nUu5esdznHIjeD+b9lHEkQ32/vlZI2uiPNqbIzvhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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