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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cbc742c56857e7f7a5156c89492023b90867fc10e5f5c2f407ae1c346cb876e' 
  AND token = 'VZPGUDM4udhe2TIL4NIglO1YD90IjG9gsXK7dsKTXBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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