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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3585b126fa4c6e8f5dae639a7435df44acfdc25729e14ab6a034e8e1f82cba6b' 
  AND token = 'hb6WaF0lsHjBNdxkc+H0IfXv6sDypNNd4l1n+XONro4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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