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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fce069320da97a27b521bc144fbe012f4e9dfd52bb99e7a54cb9f4ff8dc7d42' 
  AND token = 'o8uThPQkOjBB9VzyEbGSOBB07RA0OYzSDvD+OlH4DgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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