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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '723dc69bf26d5668cdf3c6437d0981709991bdc290f7b8aedf0d18936c1b98fb' 
  AND token = 'ifTX7+xMVEGVZg2HMIbAcRP1hUQhZeZ7nODD369Nz6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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