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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56156bf34e9d8026e459ce1ddf5ea87b6b51e652a37716a386bf4e52f286b16b' 
  AND token = 'GrGpCyJJOGK5o33aUBaxu55TChxUBIJflBY/tYGBXCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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