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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c5466c0df061591769c2d81208ccfb2c304a274c30f3516d146d3cf2fdfd1e5' 
  AND token = 'Q8zoMzlK/ZL6/luvCiVJsbdyl/x5hiqZtboz9Fm4hk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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