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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74cd1e1cae0cee55f65a6e178ee48b5afc2cf3f14dc39a1560c38221a2a4f3ce' 
  AND token = 'DNjgu4LdJEm8F/w1ns9B22LJTsQaUWzkBsAXLnERXMc=' 
  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"
    }
  }
}