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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f09e35a3fbfc43b319d70f95552acd02e5e77a61120fc2a5243ddc17ac45b73' 
  AND token = 'CXiUaQHEdep4SRv2jaWTDAjGbfgG0Ek51WU01/Lhcng=' 
  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"
    }
  }
}