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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3cab5138d39634d93e3ed87e0f35e92c4b9aabc31a92423ff0bfb58869b200' 
  AND token = '1oJitsOMWj6nBH2d45JwS4jK+ZaoQ+JKaHoMRR8CbNM=' 
  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"
    }
  }
}