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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7dcb2f29a0654f853a2388bb64b59869e06f46689545163edb057b0ef6144c' 
  AND token = '2NtVyQEAs4eP6LIE4Jd32w0efZ1iGkZgzxZX3tJKCVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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