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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f0b90093e71729890443f73e6e6c805a6f73fd0c4c9b61cfe97bf35916d02a' 
  AND token = 'R/K0Kf1sl/QrjgIFL+2rUOa33sUH6L96SoTeigy8BaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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