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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7723fc585b2f3e6d50e575f813e07c13d6642b4969be3d5818fe1a41e2466c7e' 
  AND token = 'uSf041G7FoR7J/H0OGcM4C3mn/ibfegZcb338Cmjei0=' 
  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"
    }
  }
}