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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71bb784b9df5926f46567b58075a3d95e7996ac179f5cadc4039058ffd5875e1' 
  AND token = 'EjaHvaVM/0HTvmBp9S42RTt7ZVPEnC24gRTv0biVosE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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