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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef2e7a3e70ff5075e2cb6b7fcd5a5848b3efe98cfae15732396507fab101ccd' 
  AND token = 'nGXPinc48l6Q4hS8EQVuTYxd+TLEmZDWpWQdHzqa+PU=' 
  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"
    }
  }
}