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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd872492b8dc2ae3417d555124937230dae00d9c6162fc8d35555a438520813' 
  AND token = 'pjdZTmP6zyghE8dME4GtS55iy6eVYzVRbQs2FrLB2y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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