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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1acf5ac7c594cb6a8b464001e9148b1e535be5cdd0a9789d06fa8f03c8cffdd7' 
  AND token = 'jEosY5uh/y2mDQT3jQ4LVVMtIeiJWIXz/v+WYW1KT3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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