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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dc9a0b5865bc9a7404cbcf9674021484dbce1d395a3da02908efd4f30437142' 
  AND token = 'kPageR/+9GV6RfpdoL/vdyh/Z4pjhz0C/mrF61ff0r0=' 
  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"
    }
  }
}