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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd927cfcc465b4bd16aff3cb9e21c4892f9591ced8f799d1e21a3c852fe8c6be7' 
  AND token = '+sikA6w+59cH0dgswcaSCUrvS4rAiFe/6ggV7erf6uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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