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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a9fd3aa6470ca9acd959fa9211373b62cfe49c1ea7ef69434e57a2107d8661' 
  AND token = '76wB3Adlqd0pAB9Vw4S4yND9pN/NFenNqAyFjz/KLTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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