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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b2df3026345534cc68761861770b254424536938a4a6bbc469e0690a25ae3cd' 
  AND token = 'V95o5xrjwnxYS7CBgyyo5x5se/Jm8DA0QlKWlp2zSH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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