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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7e636d1512cd92ab5d166e0cb6e99e14ea0e01857c9d145ce31bcffff7865b' 
  AND token = 'YT12XUYS3ibZVZgT0ElA8KiygI/F3XIzISOjlROqhmo=' 
  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"
    }
  }
}