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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56dd3d3820be4af7856cef6b0a4a1ecc99458e398c3805bb44e1bc90865e85d5' 
  AND token = 'tyrUHGqSPLn7XhkHqIhQALnG11xBh3TQ3B3vV1d6srU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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