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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8157ec7a44f589be88235f1096ea4591974d2dc7996530ef0ecb7d56d00ecd' 
  AND token = '4OO9+dYGjvO0dHbEBb6trKgiakIAMGya2D9azKJCNnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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