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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e950fd43e13eb69761ad69e6b50fcb9f18063afd39facb73398ac1f90eada6' 
  AND token = 'sQQgWHKL1uR7MU1f+iHjr1Uhl8Vd0dUt4xuYT1Kz2Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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