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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '478f7550e5d22d403b2449fdd8c19636d48932faf00a161d5ec902da7de7ec9e' 
  AND token = 'czNvC5Iz/BlUSBkcTQKGRO30J7yo6hsMj83r0rr/mSA=' 
  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"
    }
  }
}