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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acc6c164e5817d27531ce063ea952b26fb400ba7e0825dbc03165b378fe3ecbd' 
  AND token = '6uOewmYBeIPj26uNE94ao0p113qjTzy1Oabs3AduUHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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