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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034614e087d133cf5c8f3b4d60081e35ea60077e917ebfcc2fdf130abeed25a2' 
  AND token = 'cw/D/xO4wVkDoXqbFSJ30nRMWfzy2uHLlvBY4ShEikA=' 
  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"
    }
  }
}