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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3663afb69908be817dc3fb2e97406175bae6d01c54fc9bf39252170c7addf8d9' 
  AND token = 'cAMANa+fOSyAB+53lnB2pjNxuZfVV1JkI01KGJYCknU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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