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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8fdc00bc7f5c3c1fa53b09b48f2c51472c30c6bfaef06a99940f5bf3ba589e7' 
  AND token = 'O5hSRkp8+nMDd5Qi23XH6hy92MFpDLqYpgQyR7p2ahA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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