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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef9c95b2fec29f34c4c5b031eca88152cd9e3f42da1b05c7e9d7c91fba26f0e4' 
  AND token = 'OYIfTfAMHra8YrSyA845crGWlfM1TDPytQFeAx0/7sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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