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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f2cae81aa310e3c6792bec65569eb2cbf0f5cb862b53f63ab18cdf32f523e88' 
  AND token = 'VVz9ONAewyi/6EJ04vn/+TUtJD6KK9IHadc5aj7U6SM=' 
  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"
    }
  }
}