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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88bdacfba93095d88f7db9f7272cb04f9e88e98c5b50d5ccd2a0d85527e1e689' 
  AND token = 'nend7+rQZYDiCOkmt4d0aXVyab8UZ9/LdULC0o83dM0=' 
  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"
    }
  }
}