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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc59efe5a0480946fe4b6843bbc91f991735112043c55ef52682f3b0beef82b2' 
  AND token = 'HPoLMcT7hO89TGC9zp4nV18kZJYsEfvZlXn6WcWlXL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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