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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc69b7b42f33f506f82706678ade8594d6e87ce5b737414ba1b0752d00399c5' 
  AND token = 'Z938+sfoqasQRpyRurWmtQmo4efon+Ys2dzGZbbjqy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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