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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557c4bcfd8656446552bc5b4a2abeb867a412dae153229e7ace3d411138cbc5c' 
  AND token = 'jEwj91VQALf0TzUj+4zQvfOvVBG4TMiEvZv272x56rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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