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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a18ff9b3469109933aa5196d7025f39b64fa89b8f9a0253159d6a785877a7c02' 
  AND token = 'LR3zz1aSNkwJxk9ZajVFPzCYPgxv4C1QkCPaLVhyl0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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