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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2407a778c1c7f2c44e0649e165661915134c3bacc0f503d3e5c8732ace59807a' 
  AND token = '/2w4A5e/kzgFQ8+8RUXn4LExSOLWetzC8N+FOK8aa0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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