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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b595da29570e912831a358466889e50aa8d9295f31a1afb40944e2c0e45c57d' 
  AND token = 'XxAi5ol4hf+wmkcOTMLUeHAufPEYtk5IcSEY1dnWoYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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