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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7748779cf51116db894fddc68df5c36537813ffca5149b9415a7690d6ad4f4' 
  AND token = 'Y3M65DENF273nizpb6fBR2xrorej1jbfE3FwuSw/wQE=' 
  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"
    }
  }
}