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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3effc44274afe6a75ef3357b2c7da7ae0d1c7e6072fc6c10b5d0906bdc2ec8c3' 
  AND token = 'yMSXcF/5I/ip8AxwBeLJ0pc9g/g9lc4li8ADiBnm3Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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