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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa6d005a3f603006d2b5c023eed5f2fe05c2d00e2218c91d8be98e68a2e8162' 
  AND token = '/nyaf12xTJAailasBGIrsD5Xw747fvsOse/AGwyXCKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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