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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e6e0b446866f2e2c961ce6b1d5c015f29bbd123414319b06fc09f2f7d05b706' 
  AND token = 'KhIGrgoSkj+mlPclb0RSrdAXRscMg+TZ42PL4D5r9wk=' 
  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"
    }
  }
}