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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d132b7ab1d8253bd28c82e50ddb67fb1e44be5014285511760bea29d963cdba' 
  AND token = '0ZgVZsOku6kRko2FP/oPdD09yK226BswIO5wWMmCY6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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